It won't show anything until you have enough ratings. If you don't have any post with at least one rating, then nothing will show up in that list. If that's not the problem, then could you give a link to your site and also mention your version of php and mysql?

Thanks for your response. What I realized after a while was that the mySQL query in _starrating.plugin.php included the category id in the WHERE clause. So the query was returning different results on different blogs. I was able to modify the query and return the top rated posts on all blogs (which is what I wanted). This is working great now.

I have run into another issue that you might be able to help me with. For some reason, Star Rating is no longer appearing under the list of Text Renderers on the Write tab in the back office when posts are composed. I have the 'Apply rendering' setting set to 'Opt-out' at the moment.

Do you think that uninstalling and then reinstalling the plugin would correct this?

Hmm, that's a strange problem. First try various values in the plugin settings like opt-in, always, etc, just to see if that knocks some sense into the plugin. If not, try reinstalling, which will erase all of the votes so far.